FLORA OF VIETNAM Orchidaceae Thelasis pygmaea (Griff.) Blume
Vietnam, Thua Thien – Hue Prov., A Luoi Distr., A Roang Municipality, Tra Lenh Forestry Department station, around point 16°04′41′'N, 107°29′06′'E.
Primary closed evergreen broad-leaved forest on very steep mountain slopes composed with shale, sandstone and granite along rocky stream valley at elevation 500-700 m a.s.l.